.62cal Jug Choke complete, barrel on it's way back

[roundball]

Gunsmith in Iowa Emailed to say he finished the Jug Choke I wanted in a 33" GM Flint smoothbore barrel...honed an expansion chamber .030" for a full choke effect...UPS has it on the way, should have it Tuesday...I see a vacation day in the cards next week !!

 

[Slowpoke]

Is that the guy Lowell Tennyson....that Mike Brooks suggested? I'm thinking about making another smoothbore just for turkeys.... I was going to giving him a try.

While I'm throwing questions at you... are you going to get one of those Green Mountain 32 caliber drop in barrels? I saw on e-bay a couple weeks ago some guy had a Green Mountain .315 mould that G.M is making for that barrel.

Chuck

 

[roundball]

Is that the guy Lowell Tennyson....that Mike Brooks suggested? I'm thinking about making another smoothbore just for turkeys.... I was going to giving him a try.

While I'm throwing questions at you... are you going to get one of those Green Mountain 32 caliber drop in barrels? I saw on e-bay a couple weeks ago some guy had a Green Mountain .315 mould that G.M is making for that barrel.
Chuck

Yes, Lowell is the gunsmith that did it...and that's precisely what I had it jugged for...long range Turkey patterns without having to bother with paper shot cups...might even try some trap targets at the range just for the uniqueness of it.

No, I don't have any plans to get such a small caliber as a .32...can hardly use all the calibers I've already got...suspect I'll hold the line at the .45cal being my smallest...throttled back it's very accurate and fine for squirrels.

 

[Russianblood]

I look foward to your range report. They are always so detailed! :hatsoff:

 

[wtilenw]

Roundball,
Can you explain the physical aspects of a "Jug Choke" and how it works? I have heard the term but can't get a picture of it in my mind.
Thanks,
Idaho PRB

 

[roundball]

Roundball,
Can you explain the physical aspects of a "Jug Choke" and how it works? I have heard the term but can't get a picture of it in my mind.
Thanks,
Idaho PRB

A section of the bore is honed out a little larger than the original diameter of the bore, beginning about an inch back inside the muzzle and running down bore several inches.

Imagine a 6" section of the bore having the middle 3" honed/enlarged into what is called an expansion chamber, with a 1.5" tapered cone on either side of the 3" expansion chamber.

The shot column travels up the bore...begins to expand in the first tapered section and is fully expanded through the center section (expansion chamber) and is then forced back down in the next tapered section to the original "cylinder bore" diameter just before exiting the muzzle.

The dynamics of this action somehow produces the same results on a shot column as does an actual physical choke in a modern shotgun.

The amount of honing to create the expansion chamber determines the amount of choke effect.
ie: if the expansion chamber is honed out .030" larger than the original bore, the result is a Full Choke.

 

[rebel727]

How does this affect shooting patched balls?

 

[roundball]

How does this affect shooting patched balls?

Personally don't know yet, but a few others on the Forum say it has no effect...

 

[wtilenw]

Thanks Roundball. :v I've got it now.
Idaho PRB

 

[dlbrow]

Could you provide an e-mail address for Lowell Tennyson. I would like to contact him about installing a jug choke in my GM smoothbore barrel.

 

[roundball]

Could you provide an e-mail address for Lowell Tennyson. I would like to contact him about installing a jug choke in my GM smoothbore barrel.

Don't have his Email address here with me but Mike Brooks had posted this info several weeks ago:

Lowell Tennyson
209 E Lotte St
Blue Grass, IA 52726-9708
Phone: (563) 381-3711